When selecting a picture, the upload failed. At first, I thought that the path did not have write permission. After looking at it, I found that the picture that failed had actually been uploaded to the server directory, but it failed when editing. This error does not appear under the http protocol. It is just modified. The error occurred after signing the agreement. At present, I only think this is the reason! Has anyone encountered similar problems? Please help! 
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Uploading images will call a PHP request, use developer mode to check whether the request is normal